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Entity Level Information - Composition of Revenues (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Entity Wide Information Revenue From External Customer [Line Items]        
Total revenues $ 14,393 $ 28,850 $ 48,157 $ 99,081
Product Sales        
Entity Wide Information Revenue From External Customer [Line Items]        
Total revenues 14,337 28,773 48,074 98,714
Services        
Entity Wide Information Revenue From External Customer [Line Items]        
Total revenues $ 56 $ 77 $ 83 $ 367